IISc is a prestigious institute, and getting an internship there is equally prestigious and rewarding. Some internships are paid while others are not, but the exposure and experience one gets through them is totally worth it. You just need to get a good letter of recommendation, have good grades and consistently check their website for the application details. Also, don’t get disheart... https://www.sciastra.com/blog/how-do-i-get-a-summer-internship-in-iisc-bangalore/